g++ -o he.exe main.o cjson.o libcrypto.a

libcrypto.a(rand_win.o):rand_win.c:(.text+0xf0b): undefined reference to `GetDeviceCaps@8'
libcrypto.a(rand_win.o):rand_win.c:(.text+0xf20): undefined reference to `GetDeviceCaps@8'
libcrypto.a(rand_win.o):rand_win.c:(.text+0xf39): undefined reference to `CreateCompatibleBitmap@12'
libcrypto.a(rand_win.o):rand_win.c:(.text+0xf5c): undefined reference to `GetObjectA@12'
libcrypto.a(rand_win.o):rand_win.c:(.text+0x102c): undefined reference to `GetDIBits@28'
libcrypto.a(rand_win.o):rand_win.c:(.text+0x109d): undefined reference to `DeleteObject@4'

collect2: ld returned 1 exit status

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